lm27cim5-2hj National Semiconductor Corporation, lm27cim5-2hj Datasheet

lm27cim5-2hj

Manufacturer Part Number

lm27cim5-2hj

Description

Sot-23, ?3?c Accurate, 120?c-150?c Factory Preset Thermostat

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM27CIM5-2HJ.pdf (10 pages)

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LM27

SOT-23,

Thermostat

General Description

The LM27 is a precision, single digital-output, low-power

thermostat comprised of an internal reference, DAC, tem-

perature sensor and comparator. Utilizing factory program-

ming, it can be manufactured with different trip points as well

as different digital output functionality. The trip point (T

can be preset at the factory to any temperature in the range

of +120˚C to +150˚C in 1˚C increments. The LM27 has one

digital output (OS/OS/US/US), one digital input (HYST) and

one analog output (V

preset as either open-drain or push-pull. In addition, it can be

factory programmed to be active HIGH or LOW. The digital

output can be factory programmed to indicate an over tem-

perature shutdown event (OS or OS) or an under tempera-

ture shutdown event (US or US). When preset as an over-

temperature shutdown (OS) it will go LOW to indicate that

the die temperature is over the internally preset T

HIGH when the temperature goes below (T

larly, when preprogrammed as an undertemperature shut-

down (US) it will go HIGH to indicate that the temperature is

below T

2˚C or 10˚C and is controlled by the state of the HYST pin. A

to temperature and has a −10.7mV/˚C output slope.

Currently, there are several standard parts available, see

ordering information for details. For other part options, con-

tact a National Semiconductor Distributor or Sales Repre-

sentative for information on minimum order qualification. The

LM27 is currently available in a 5-lead SOT-23 package.

LM27CIM5-2HJ Simplified Block Diagram and Connection Diagram

TEMP

HYST

analog output provides a voltage that is proportional

and go LOW when the temperature is above

). The typical hysteresis, T

TEMP

3˚C Accurate, 120˚C-150˚C Factory Preset

please see ordering information or contact National Semiconductor.

). The digital output stage can be

For other trip point and output function availability,

The LM27CIM5-2HJ has a fixed trip point of 140˚C.

HYST

DS200307

, can be set to

–T

HYST

). Simi-

and go

)

Applications

n Microprocessor Thermal Management

n Appliances

n Portable Battery Powered Systems

n Fan Control

n Industrial Process Control

n HVAC Systems

n Electronic System Protection

Features

n Internal comparator with pin selectable 2˚C or 10˚C

n No external components required

n Open-drain or push-pull digital output; supports CMOS

n Internal temperature sensor with V

n V

n Internal voltage reference and DAC for trip-point setting

n Currently available in 5-pin SOT-23 plastic package

n Excellent power supply noise rejection

Key Specifications

hysteresis

logic levels

TEMP

Power Supply Voltage

Power Supply Current

Hysteresis Temperature

Temperature Trip Point Accuracy

output allows after-assembly system testing

TEMP

20030701

2˚C or 10˚C(typ)

September 2006

output pin

2.7V to 5.5V

www.national.com

40µA(max)

3˚C (max)

15µA(typ)

Related parts for lm27cim5-2hj

lm27cim5-2hj Summary of contents

Page 1

... The LM27 is currently available in a 5-lead SOT-23 package. LM27CIM5-2HJ Simplified Block Diagram and Connection Diagram The LM27CIM5-2HJ has a fixed trip point of 140˚C. For other trip point and output function availability, please see ordering information or contact National Semiconductor. ...

Page 2

... For more detailed information on the suffix meaning see the part number template at the end of the Electrical Charac- teristics Section. Contact National Semiconductor for other set points and output options. Order Number 3000 Units in Tape Bulk Rail & Reel LM27CIM5-ZHJ LM27CIM5X-ZHJ LM27CIM5-1HJ LM27CIM5X-1HJ LM27CIM5-2HJ LM27CIM5X-2HJ Connection Diagram Pin Descriptions Pin Number Pin Name 1 HYST 2 GND ...

Page 3

Absolute Maximum Ratings Input Voltage Input Current at any pin (Note 2) Package Input Current(Note 2) Package Dissipation 25˚C A (Note 3) Soldering Information SOT23 Package Vapor Phase (60 seconds) Infrared (15 seconds) Storage Temperature LM27 Electrical ...

Page 4

... For example: • the part number LM27CIM5-2SJ has T output. • the part number LM27CIM5-ZLN has T output. Active-high open-drain and active-low push-pull options are available, please contact National Semiconductor for more informa- tion. www.national.com (Continued) < > GND 150˚ ...

Page 5

... TEMP output to change state, thereby verifying that the comparator and output circuitry function after assembly. Here is a sample test procedure that can be used to test the LM27CIM5X-2HJ which has a 140˚C trip point Turn on V and measure V . Then calculate the ...

Page 6

Applications Hints (Continued) TABLE 1. Resistive compensation for capacitive loading of V TEMP C LOAD ≤100pF 1nF 10nF 100nF ≥1µ series with capacitor series with signal path FIGURE 2. Resistor placement for capacitive loading ...

Page 7

Typical Applications Note: The fan’s control pin has internal pull-up. The 10k pull-down sets a slow fan speed. When the output of the LM27 goes low, the fan will speed up. FIGURE 4. Two Speed Fan Speed Control FIGURE 5. ...

Page 8

Typical Applications FIGURE 7. Audio Power Amplifier Thermal Protection www.national.com (Continued) FIGURE 8. Simple Thermostat 8 20030722 20030723 ...

Page 9

... Tel: 1-800-272-9959 Deutsch Tel: +49 (0) 69 9508 6208 English Français Tel: +33 ( 8790 Order Number LM27CIM5 or LM27CIM5X NS Package Number MA05B 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

Page 10

Tel: 81-3-5639-7560 ...

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